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As Langdon’s eyes took in the sacred chamber, his first reaction was one of embarrassment. He realized what a callow romantic he was. The images he had held for so many years of this room could not have been more inaccurate. He had imagined dusty bookshelves piled high with tattered volumes, priests cataloging by the light of candles and stained-glass windows, monks poring over scrolls…

Not even close.

At first glance the room appeared to be a darkened airline hangar in which someone had built a dozen free-standing racquetball courts. Langdon knew of course what the glass-walled enclosures were. He was not surprised to see them; humidity and heat eroded ancient vellums and parchments, and proper preservation required hermitic vaults like these—airtight cubicles that kept out humidity and natural acids in the air. Langdon had been inside hermetic vaults many times, but it was always an unsettling experience… something about entering an airtight container where the oxygen was regulated by a reference librarian.

The vaults were dark, ghostly even, faintly outlined by tiny dome lights at the end of each stack. In the blackness of each cell, Langdon sensed the phantom giants, row upon row of towering stacks, laden with history. This was one hell of a collection.

Vittoria also seemed dazzled. She stood beside him staring mutely at the giant transparent cubes.

Time was short, and Langdon wasted none of it scanning the dimly lit room for a book catalog—a bound encyclopedia that cataloged the library’s collection. All he saw was the glow of a handful of computer terminals dotting the room. "Looks like they’ve got a Biblion. Their index is computerized."

Vittoria looked hopeful. "That should speed things up."

Langdon wished he shared her enthusiasm, but he sensed this was bad news. He walked to a terminal and began typing. His fears were instantly confirmed. "The old-fashioned method would have been better."

"Why?"

He stepped back from the monitor. "Because real books don’t have password protection. I don’t suppose physicists are natural born hackers?"

Vittoria shook her head. "I can open oysters, that’s about it."

Langdon took a deep breath and turned to face the eerie collection of diaphanous vaults. He walked to the nearest one and squinted into the dim interior. Inside the glass were amorphous shapes Langdon recognized as the usual bookshelves, parchment bins, and examination tables. He looked up at the indicator tabs glowing at the end of each stack. As in all libraries, the tabs indicated the contents of that row. He read the headings as he moved down the transparent barrier.

Pietro Il Erimito… Le Crociate… Urbano II… Levant…

"They’re labeled," he said, still walking. "But it’s not alpha-author." He wasn’t surprised. Ancient archives were almost never cataloged alphabetically because so many of the authors were unknown. Titles didn’t work either because many historical documents were untitled letters or parchment fragments. Most cataloging was done chronologically. Disconcertingly, however, this arrangement did not appear to be chronological.

Langdon felt precious time already slipping away. "Looks like the Vatican has its own system."

"What a surprise."

He examined the labels again. The documents spanned centuries, but all the keywords, he realized, were interrelated. "I think it’s a thematic classification."

"Thematic?" Vittoria said, sounding like a disapproving scientist. "Sounds inefficient."

Actually… Langdon thought, considering it more closely. This may be the shrewdest cataloging I’ve ever seen. He had always urged his students to understand the overall tones and motifs of an artistic period rather than getting lost in the minutia of dates and specific works. The Vatican Archives, it seemed, were cataloged on a similar philosophy. Broad strokes…

"Everything in this vault," Langdon said, feeling more confident now, "centuries of material, has to do with the Crusades. That’s this vault’s theme." It was all here, he realized. Historical accounts, letters, artwork, socio-political data, modern analyses. All in one place… encouraging a deeper understanding of a topic. Brilliant.

Vittoria frowned. "But data can relate to multiple themes simultaneously."

"Which is why they cross-reference with proxy markers." Langdon pointed through the glass to the colorful plastic tabs inserted among the documents. "Those indicate secondary documents located elsewhere with their primary themes."

"Sure," she said, apparently letting it go. She put her hands on her hips and surveyed the enormous space. Then she looked at Langdon. "So, Professor, what’s the name of this Galileo thing we’re looking for?"